a ship that can travel underwater潜艇
More examples
The submarine sailed deep under the ice cap.
The submarine surfaced a few miles off the coast.
The submarine dived just in time to avoid the enemy attack.
The president has agreed to allocate further funds to develop the new submarine.
A spokesman for the dockyard said they hoped to launch the first submarine within two years.
existing below the surface of the sea海面下的,海底的
noun
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